Arial Black
Adventurer
I never bother trying to make up a stupid story as to why I'm acting rationally.Let me put it another way. If I say that's fine but the fey queen expects you to drop concentration on the hex once the sacrifice is made (because it is for the sacrifice), is that still good by you? If it is, then we don't have an issue, you do your thing! I don't even have an issue with you taking a short rest to recover the slot. I'll even probably throw in a bit of extra RP XP.
If on the other hand you hem and haw (or worse, outright argue) about how that's not how you envisioned it working, then as I see it you were trying to pull one over on the DM using RP to cover your true intentions. Because if it was done for a cool, evocative RP moment, it shouldn't matter whether you get to maintain concentration after it is done. That only matters if you are trying to game the system and squeak out a tiny extra advantage that I'd let you have for free if you'd just talked to me about it instead of trying to pull a fast one.
I hex whatever creature is about to be breakfast, not as some made-up ritual but because a.) I need to eat today, b.) because I want to cast both hex and aid, then rest to recover those slots before adventuring, and c.) because this one action serves both purposes.
Mage armour lasts 8 hours. If my multiclass warlock casts mage armour and then rests, is this an 'exploit'? The kind of exploit where the universe itself punishes me by altering its own laws just to vex me?
A wizard casts mage armour as the party set out. Wait, he's not wasting his first action in combat to cast it? This is exploiting how the spell works! Gaming the system! As soon as he casts it his deity strips him of the power to cast spells and a [collective noun] of tarrasques attacks with surprise!